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.TH PTHREAD_EQUAL 3 2021-03-22 "Linux" "Linux Programmer's Manual"
.SH NAME
pthread_equal \- compare thread IDs
.SH SYNOPSIS
.nf
.B #include <pthread.h>
.PP
.BI "int pthread_equal(pthread_t " t1 ", pthread_t " t2 );
.PP
Compile and link with \fI\-pthread\fP.
.fi
.SH DESCRIPTION
The
.BR pthread_equal ()
function compares two thread identifiers.
.SH RETURN VALUE
If the two thread IDs are equal,
.BR pthread_equal ()
returns a nonzero value; otherwise, it returns 0.
.SH ERRORS
This function always succeeds.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR pthread_equal ()
T}	Thread safety	MT-Safe
.TE
.hy
.ad
.sp 1
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
.SH NOTES
The
.BR pthread_equal ()
function is necessary because thread IDs should be considered opaque:
there is no portable way for applications to directly compare two
.I pthread_t
values.
.SH SEE ALSO
.BR pthread_create (3),
.BR pthread_self (3),
.BR pthreads (7)
.SH COLOPHON
This page is part of release 5.13 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
